Contact Widget: Captcha over-runs and sometimes contains no characters

Just installed in left sidebar. Works okay, but Captcha overruns margin, and user will have to know to refresh when Captcha image is illegible. My typical users (senior citizens) will not know to “rollover” for info, and may not recognize these 2 boxes as a Captcha.

I’d like to install a Captcha where characters are somewhat legible. I also want it to fit into the column.

Thank you.